Sleep Innovations 1.5-Inch Memory Foam Mattress Topper, Cal King Sleep innovations 1-1/2-inch cal king-size sculpted memory foam topper provides improved comfort, circulation, and alignment; great alternative to mattress purchase Open-cell construction for superior breathability and air flow; never too hot, never too cold; 100-percent polyurethane hypoallergenic memory foam with 3-pound density; open-cell design for air flow and neutral surface temperature After unpacking allow up to 72 hours for topper to fully expand Premium memory foam relieves painful pressure points; helps to reduce tossing and turning Topper measures 84-inch long by 72-inch wide by 1-1/2-inch high Sleep innovations 1-1/2-inch cal king-size sculpted memory foam topper provides improved comfort, circulation, and alignment; great alternative to mattress purchase